- From: Gavin Treadgold <gt@kestrel.co.nz>
- Date: Wed, 17 Sep 2008 15:27:40 +1200
- To: public-xg-eiif <public-xg-eiif@w3.org>
On 2008-09-17, at 1502, Nuwan Waidyanatha wrote: > IMO, location is relatively static because earth does rotate; relative > to the sun; therefore, the address, if labeled as a location, is in > motion. No it isn't, as most of the co-ordinate systems used for location are fixed to the earth's frame of reference - this includes the underlying model (e.g. a global geoid that approximates the chape of the earth, or a regional grid that approximates a country or jurisdiction. These are usually either global co-ordinate systems or local - e.g. jurisdictions, regions or countries. The application of them depends on the accuracy required and the application of the data e.g. cadestral databases generally require a high degree of precision and are more prone to say shifting of tectonic plates over time. In summary, most of the systems we use, such as WGS84 & Lat/Long move with the Earth's rotation so it is not an issue. Cheers Gav
Received on Wednesday, 17 September 2008 03:28:28 UTC